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id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Videz"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Videz" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " 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class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Posebno:Registracija&returnto=Povr%C5%A1inska+napetost" title="Predlagamo vam, da si ustvarite račun in se prijavite, vendar to ni obvezno." class=""><span>Ustvari račun</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Posebno:Prijava&returnto=Povr%C5%A1inska+napetost" title="Prijava je zaželena, vendar ni obvezna [o]" accesskey="o" class=""><span>Prijava</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Več možnosti" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " 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mw-list-item"><a href="/w/index.php?title=Posebno:Registracija&returnto=Povr%C5%A1inska+napetost" title="Predlagamo vam, da si ustvarite račun in se prijavite, vendar to ni obvezno."><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Ustvari račun</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Posebno:Prijava&returnto=Povr%C5%A1inska+napetost" title="Prijava je zaželena, vendar ni obvezna [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Prijava</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Strani za neprijavljene urejevalce <a href="/wiki/Pomo%C4%8D:Uvod" aria-label="Več o urejanju"><span>več o tem</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Posebno:MojiPrispevki" title="Seznam urejanj s tega IP-naslova [y]" accesskey="y"><span>Prispevki</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Posebno:MojPogovor" title="Pogovor o urejanjih s tega IP-naslova [n]" accesskey="n"><span>Pogovorna stran</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Projekt"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Vsebina" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Vsebina</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">prestavi v stransko letvico</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">skrij</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Uvod</div> </a> </li> <li id="toc-Vzrok" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Vzrok"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Vzrok</span> </div> </a> <ul id="toc-Vzrok-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Koeficient_površinske_napetosti" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Koeficient_površinske_napetosti"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Koeficient površinske napetosti</span> </div> </a> <ul id="toc-Koeficient_površinske_napetosti-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Merjenje_površinske_napetosti" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Merjenje_površinske_napetosti"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Merjenje površinske napetosti</span> </div> </a> <ul id="toc-Merjenje_površinske_napetosti-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Sklici" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Sklici"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Sklici</span> </div> </a> <ul id="toc-Sklici-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Viri" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Viri"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Viri</span> </div> </a> <ul id="toc-Viri-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Vsebina" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Vklopi kazalo vsebine" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Vklopi kazalo vsebine</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Površinska napetost</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="P9jdi na članek v drugem jeziku. Na voljo v 66 jezikih." > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-66" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">66 jezikov</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AA%D9%88%D8%AA%D8%B1_%D8%B3%D8%B7%D8%AD%D9%8A" title="توتر سطحي – arabščina" lang="ar" hreflang="ar" data-title="توتر سطحي" data-language-autonym="العربية" data-language-local-name="arabščina" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Tensi%C3%B3n_superficial" title="Tensión superficial – asturijščina" lang="ast" hreflang="ast" data-title="Tensión superficial" data-language-autonym="Asturianu" data-language-local-name="asturijščina" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9F%D0%B0%D0%B2%D0%B5%D1%80%D1%85%D0%BD%D0%B5%D0%B2%D0%B0%D0%B5_%D0%BD%D0%B0%D1%86%D1%8F%D0%B6%D1%8D%D0%BD%D0%BD%D0%B5" title="Паверхневае нацяжэнне – beloruščina" lang="be" hreflang="be" data-title="Паверхневае нацяжэнне" data-language-autonym="Беларуская" data-language-local-name="beloruščina" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9F%D0%BE%D0%B2%D1%8A%D1%80%D1%85%D0%BD%D0%BE%D1%81%D1%82%D0%BD%D0%BE_%D0%BD%D0%B0%D0%BF%D1%80%D0%B5%D0%B6%D0%B5%D0%BD%D0%B8%D0%B5" title="Повърхностно напрежение – bolgarščina" lang="bg" hreflang="bg" data-title="Повърхностно напрежение" data-language-autonym="Български" data-language-local-name="bolgarščina" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%AA%E0%A7%83%E0%A6%B7%E0%A7%8D%E0%A6%A0%E0%A6%9F%E0%A6%BE%E0%A6%A8" title="পৃষ্ঠটান – bengalščina" lang="bn" hreflang="bn" data-title="পৃষ্ঠটান" data-language-autonym="বাংলা" data-language-local-name="bengalščina" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Povr%C5%A1inski_napon" title="Površinski napon – bosanščina" lang="bs" hreflang="bs" data-title="Površinski napon" data-language-autonym="Bosanski" data-language-local-name="bosanščina" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Tensi%C3%B3_superficial" title="Tensió superficial – katalonščina" lang="ca" hreflang="ca" data-title="Tensió superficial" data-language-autonym="Català" data-language-local-name="katalonščina" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Povrchov%C3%A9_nap%C4%9Bt%C3%AD" title="Povrchové napětí – češčina" lang="cs" hreflang="cs" data-title="Povrchové napětí" data-language-autonym="Čeština" data-language-local-name="češčina" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%C3%87%D0%B8%D0%B9%D0%B5%D0%BB_%D0%BA%D0%B0%D1%80%C4%83%D0%BD%D0%B0%D0%B2%C4%95" title="Çийел карăнавĕ – čuvaščina" lang="cv" hreflang="cv" data-title="Çийел карăнавĕ" data-language-autonym="Чӑвашла" data-language-local-name="čuvaščina" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Overfladesp%C3%A6nding" title="Overfladespænding – danščina" lang="da" hreflang="da" data-title="Overfladespænding" data-language-autonym="Dansk" data-language-local-name="danščina" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Oberfl%C3%A4chenspannung" title="Oberflächenspannung – nemščina" lang="de" hreflang="de" data-title="Oberflächenspannung" data-language-autonym="Deutsch" data-language-local-name="nemščina" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%95%CF%80%CE%B9%CF%86%CE%B1%CE%BD%CE%B5%CE%B9%CE%B1%CE%BA%CE%AE_%CF%84%CE%AC%CF%83%CE%B7" title="Επιφανειακή τάση – grščina" lang="el" hreflang="el" data-title="Επιφανειακή τάση" data-language-autonym="Ελληνικά" data-language-local-name="grščina" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Surface_tension" title="Surface tension – angleščina" lang="en" hreflang="en" data-title="Surface tension" data-language-autonym="English" data-language-local-name="angleščina" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Surfaca_tensio" title="Surfaca tensio – esperanto" lang="eo" hreflang="eo" data-title="Surfaca tensio" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Tensi%C3%B3n_superficial" title="Tensión superficial – španščina" lang="es" hreflang="es" data-title="Tensión superficial" data-language-autonym="Español" data-language-local-name="španščina" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Pindpinevus" title="Pindpinevus – estonščina" lang="et" hreflang="et" data-title="Pindpinevus" data-language-autonym="Eesti" data-language-local-name="estonščina" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Gainazal-tentsio" title="Gainazal-tentsio – baskovščina" lang="eu" hreflang="eu" data-title="Gainazal-tentsio" data-language-autonym="Euskara" data-language-local-name="baskovščina" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%A9%D8%B4%D8%B4_%D8%B3%D8%B7%D8%AD%DB%8C" title="کشش سطحی – perzijščina" lang="fa" hreflang="fa" data-title="کشش سطحی" data-language-autonym="فارسی" data-language-local-name="perzijščina" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Pintaj%C3%A4nnitys" title="Pintajännitys – finščina" lang="fi" hreflang="fi" data-title="Pintajännitys" data-language-autonym="Suomi" data-language-local-name="finščina" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Tension_superficielle" title="Tension superficielle – francoščina" lang="fr" hreflang="fr" data-title="Tension superficielle" data-language-autonym="Français" data-language-local-name="francoščina" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Teannas_dromchla" title="Teannas dromchla – irščina" lang="ga" hreflang="ga" data-title="Teannas dromchla" data-language-autonym="Gaeilge" data-language-local-name="irščina" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Tensi%C3%B3n_superficial" title="Tensión superficial – galicijščina" lang="gl" hreflang="gl" data-title="Tensión superficial" data-language-autonym="Galego" data-language-local-name="galicijščina" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%9E%D7%AA%D7%97_%D7%A4%D7%A0%D7%99%D7%9D" title="מתח פנים – hebrejščina" lang="he" hreflang="he" data-title="מתח פנים" data-language-autonym="עברית" data-language-local-name="hebrejščina" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AA%E0%A5%83%E0%A4%B7%E0%A5%8D%E0%A4%A0_%E0%A4%A4%E0%A4%A8%E0%A4%BE%E0%A4%B5" title="पृष्ठ तनाव – hindijščina" lang="hi" hreflang="hi" data-title="पृष्ठ तनाव" data-language-autonym="हिन्दी" data-language-local-name="hindijščina" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Povr%C5%A1inska_napetost" title="Površinska napetost – hrvaščina" lang="hr" hreflang="hr" data-title="Površinska napetost" data-language-autonym="Hrvatski" data-language-local-name="hrvaščina" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Tansyon_sifas" title="Tansyon sifas – haitijska kreolščina" lang="ht" hreflang="ht" data-title="Tansyon sifas" data-language-autonym="Kreyòl ayisyen" data-language-local-name="haitijska kreolščina" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu badge-Q17437796 badge-featuredarticle mw-list-item" title="izbrani članek"><a href="https://hu.wikipedia.org/wiki/Fel%C3%BCleti_fesz%C3%BClts%C3%A9g" title="Felületi feszültség – madžarščina" lang="hu" hreflang="hu" data-title="Felületi feszültség" data-language-autonym="Magyar" data-language-local-name="madžarščina" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Tegangan_permukaan" title="Tegangan permukaan – indonezijščina" lang="id" hreflang="id" data-title="Tegangan permukaan" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonezijščina" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Tensione_superficiale" title="Tensione superficiale – italijanščina" lang="it" hreflang="it" data-title="Tensione superficiale" data-language-autonym="Italiano" data-language-local-name="italijanščina" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E8%A1%A8%E9%9D%A2%E5%BC%B5%E5%8A%9B" title="表面張力 – japonščina" lang="ja" hreflang="ja" data-title="表面張力" data-language-autonym="日本語" data-language-local-name="japonščina" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%91%D0%B5%D1%82%D1%82%D1%96%D0%BA_%D0%BA%D0%B5%D1%80%D1%96%D0%BB%D1%83" title="Беттік керілу – kazaščina" lang="kk" hreflang="kk" data-title="Беттік керілу" data-language-autonym="Қазақша" data-language-local-name="kazaščina" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%AE%E0%B3%87%E0%B2%B2%E0%B3%8D%E0%B2%AE%E0%B3%88_%E0%B2%8E%E0%B2%B3%E0%B3%86%E0%B2%A4" title="ಮೇಲ್ಮೈ ಎಳೆತ – kanareščina" lang="kn" hreflang="kn" data-title="ಮೇಲ್ಮೈ ಎಳೆತ" data-language-autonym="ಕನ್ನಡ" data-language-local-name="kanareščina" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%91%9C%EB%A9%B4%EC%9E%A5%EB%A0%A5" title="표면장력 – korejščina" lang="ko" hreflang="ko" data-title="표면장력" data-language-autonym="한국어" data-language-local-name="korejščina" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Pavir%C5%A1iaus_%C4%AFtemptis" title="Paviršiaus įtemptis – litovščina" lang="lt" hreflang="lt" data-title="Paviršiaus įtemptis" data-language-autonym="Lietuvių" data-language-local-name="litovščina" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Virsmas_spraigums" title="Virsmas spraigums – latvijščina" lang="lv" hreflang="lv" data-title="Virsmas spraigums" data-language-autonym="Latviešu" data-language-local-name="latvijščina" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9F%D0%BE%D0%B2%D1%80%D1%88%D0%B8%D0%BD%D1%81%D0%BA%D0%B8_%D0%BD%D0%B0%D0%BF%D0%BE%D0%BD" title="Површински напон – makedonščina" lang="mk" hreflang="mk" data-title="Површински напон" data-language-autonym="Македонски" data-language-local-name="makedonščina" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%AA%E0%B5%8D%E0%B4%B0%E0%B4%A4%E0%B4%B2%E0%B4%AC%E0%B4%B2%E0%B4%82" title="പ്രതലബലം – malajalamščina" lang="ml" hreflang="ml" data-title="പ്രതലബലം" data-language-autonym="മലയാളം" data-language-local-name="malajalamščina" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%93%D0%B0%D0%B4%D0%B0%D1%80%D0%B3%D1%8B%D0%BD_%D1%82%D0%B0%D1%82%D0%B0%D0%BB%D1%86%D0%B0%D0%BB" title="Гадаргын таталцал – mongolščina" lang="mn" hreflang="mn" data-title="Гадаргын таталцал" data-language-autonym="Монгол" data-language-local-name="mongolščina" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Tegangan_permukaan" title="Tegangan permukaan – malajščina" lang="ms" hreflang="ms" data-title="Tegangan permukaan" data-language-autonym="Bahasa Melayu" data-language-local-name="malajščina" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%AA%E0%A5%83%E0%A4%B7%E0%A5%8D%E0%A4%A0_%E0%A4%A4%E0%A4%A8%E0%A4%BE%E0%A4%B5" title="पृष्ठ तनाव – nepalščina" lang="ne" hreflang="ne" data-title="पृष्ठ तनाव" data-language-autonym="नेपाली" data-language-local-name="nepalščina" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Oppervlaktespanning" title="Oppervlaktespanning – nizozemščina" lang="nl" hreflang="nl" data-title="Oppervlaktespanning" data-language-autonym="Nederlands" data-language-local-name="nizozemščina" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Overflatespenning" title="Overflatespenning – novonorveščina" lang="nn" hreflang="nn" data-title="Overflatespenning" data-language-autonym="Norsk nynorsk" data-language-local-name="novonorveščina" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Overflatespenning" title="Overflatespenning – knjižna norveščina" lang="nb" hreflang="nb" data-title="Overflatespenning" data-language-autonym="Norsk bokmål" data-language-local-name="knjižna norveščina" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%B8%E0%A8%A4%E0%A8%B9%E0%A9%80_%E0%A8%95%E0%A8%B8%E0%A8%BC%E0%A8%AE%E0%A8%95%E0%A9%B1%E0%A8%B8%E0%A8%BC" title="ਸਤਹੀ ਕਸ਼ਮਕੱਸ਼ – pandžabščina" lang="pa" hreflang="pa" data-title="ਸਤਹੀ ਕਸ਼ਮਕੱਸ਼" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="pandžabščina" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Napi%C4%99cie_powierzchniowe" title="Napięcie powierzchniowe – poljščina" lang="pl" hreflang="pl" data-title="Napięcie powierzchniowe" data-language-autonym="Polski" data-language-local-name="poljščina" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Tens%C3%A3o_superficial" title="Tensão superficial – portugalščina" lang="pt" hreflang="pt" data-title="Tensão superficial" data-language-autonym="Português" data-language-local-name="portugalščina" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro badge-Q17437796 badge-featuredarticle mw-list-item" title="izbrani članek"><a href="https://ro.wikipedia.org/wiki/Tensiune_superficial%C4%83" title="Tensiune superficială – romunščina" lang="ro" hreflang="ro" data-title="Tensiune superficială" data-language-autonym="Română" data-language-local-name="romunščina" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D0%BE%D0%B2%D0%B5%D1%80%D1%85%D0%BD%D0%BE%D1%81%D1%82%D0%BD%D0%BE%D0%B5_%D0%BD%D0%B0%D1%82%D1%8F%D0%B6%D0%B5%D0%BD%D0%B8%D0%B5" title="Поверхностное натяжение – ruščina" lang="ru" hreflang="ru" data-title="Поверхностное натяжение" data-language-autonym="Русский" data-language-local-name="ruščina" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Povr%C5%A1inski_napon" title="Površinski napon – srbohrvaščina" lang="sh" hreflang="sh" data-title="Površinski napon" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="srbohrvaščina" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%B4%E0%B7%98%E0%B7%82%E0%B7%8A%E0%B6%A8%E0%B7%92%E0%B6%9A_%E0%B6%86%E0%B6%AD%E0%B6%AD%E0%B7%92%E0%B6%BA" title="පෘෂ්ඨික ආතතිය – sinhalščina" lang="si" hreflang="si" data-title="පෘෂ්ඨික ආතතිය" data-language-autonym="සිංහල" data-language-local-name="sinhalščina" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Surface_tension" title="Surface tension – Simple English" lang="en-simple" hreflang="en-simple" data-title="Surface tension" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Povrchov%C3%A9_nap%C3%A4tie" title="Povrchové napätie – slovaščina" lang="sk" hreflang="sk" data-title="Povrchové napätie" data-language-autonym="Slovenčina" data-language-local-name="slovaščina" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Tensioni_sip%C3%ABrfaq%C3%ABsor" title="Tensioni sipërfaqësor – albanščina" lang="sq" hreflang="sq" data-title="Tensioni sipërfaqësor" data-language-autonym="Shqip" data-language-local-name="albanščina" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Povr%C5%A1inski_napon" title="Površinski napon – srbščina" lang="sr" hreflang="sr" data-title="Površinski napon" data-language-autonym="Српски / srpski" data-language-local-name="srbščina" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Ytsp%C3%A4nning" title="Ytspänning – švedščina" lang="sv" hreflang="sv" data-title="Ytspänning" data-language-autonym="Svenska" data-language-local-name="švedščina" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%AE%E0%AF%87%E0%AE%B1%E0%AF%8D%E0%AE%AA%E0%AE%B0%E0%AE%AA%E0%AF%8D%E0%AE%AA%E0%AF%81_%E0%AE%87%E0%AE%B4%E0%AF%81%E0%AE%B5%E0%AE%BF%E0%AE%9A%E0%AF%88" title="மேற்பரப்பு இழுவிசை – tamilščina" lang="ta" hreflang="ta" data-title="மேற்பரப்பு இழுவிசை" data-language-autonym="தமிழ்" data-language-local-name="tamilščina" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%A4%E0%B0%B2%E0%B0%A4%E0%B0%A8%E0%B1%8D%E0%B0%AF%E0%B0%A4" title="తలతన్యత – telugijščina" lang="te" hreflang="te" data-title="తలతన్యత" data-language-autonym="తెలుగు" data-language-local-name="telugijščina" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B9%81%E0%B8%A3%E0%B8%87%E0%B8%95%E0%B8%B6%E0%B8%87%E0%B8%9C%E0%B8%B4%E0%B8%A7" title="แรงตึงผิว – tajščina" lang="th" hreflang="th" data-title="แรงตึงผิว" data-language-autonym="ไทย" data-language-local-name="tajščina" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Y%C3%BCzey_gerilimi" title="Yüzey gerilimi – turščina" lang="tr" hreflang="tr" data-title="Yüzey gerilimi" data-language-autonym="Türkçe" data-language-local-name="turščina" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D0%BE%D0%B2%D0%B5%D1%80%D1%85%D0%BD%D0%B5%D0%B2%D0%B8%D0%B9_%D0%BD%D0%B0%D1%82%D1%8F%D0%B3" title="Поверхневий натяг – ukrajinščina" lang="uk" hreflang="uk" data-title="Поверхневий натяг" data-language-autonym="Українська" data-language-local-name="ukrajinščina" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Sirt_taranglik" title="Sirt taranglik – uzbeščina" lang="uz" hreflang="uz" data-title="Sirt taranglik" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="uzbeščina" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/S%E1%BB%A9c_c%C4%83ng_b%E1%BB%81_m%E1%BA%B7t" title="Sức căng bề mặt – vietnamščina" lang="vi" hreflang="vi" data-title="Sức căng bề mặt" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamščina" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E8%A1%A8%E9%9D%A2%E5%BC%A0%E5%8A%9B" title="表面张力 – wu-kitajščina" lang="wuu" hreflang="wuu" data-title="表面张力" data-language-autonym="吴语" data-language-local-name="wu-kitajščina" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E8%A1%A8%E9%9D%A2%E5%BC%A0%E5%8A%9B" title="表面张力 – kitajščina" lang="zh" hreflang="zh" data-title="表面张力" data-language-autonym="中文" data-language-local-name="kitajščina" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Pi%C3%A1u-b%C4%ABn_tiong-la%CC%8Dt" title="Piáu-bīn tiong-la̍t – min nan kitajščina" lang="nan" hreflang="nan" data-title="Piáu-bīn tiong-la̍t" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="min nan kitajščina" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E8%A1%A8%E9%9D%A2%E5%BC%B5%E5%8A%9B" title="表面張力 – kantonščina" lang="yue" hreflang="yue" data-title="表面張力" data-language-autonym="粵語" data-language-local-name="kantonščina" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q170749#sitelinks-wikipedia" title="Uredi medjezikovne povezave" class="wbc-editpage">Uredi povezave</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Imenski prostori"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Povr%C5%A1inska_napetost" title="Ogled vsebinske strani [c]" accesskey="c"><span>Stran</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Pogovor:Povr%C5%A1inska_napetost" rel="discussion" title="Pogovor o vsebinski strani [t]" accesskey="t"><span>Pogovor</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Spremeni različico jezika" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">slovenščina</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Pogledi"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Povr%C5%A1inska_napetost"><span>Preberi</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Povr%C5%A1inska_napetost&veaction=edit" title="Uredite to stran [v]" accesskey="v"><span>Uredi stran</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Povr%C5%A1inska_napetost&action=edit" title="Uredi izvorno kodo te strani [e]" accesskey="e"><span>Uredi kodo</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Povr%C5%A1inska_napetost&action=history" title="Prejšnje redakcije te strani [h]" accesskey="h"><span>Zgodovina</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Orodja strani"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Orodja" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Orodja</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Orodja</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">prestavi v stransko letvico</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">skrij</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Več možnosti" > <div class="vector-menu-heading"> Dejanja </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Povr%C5%A1inska_napetost"><span>Preberi</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Povr%C5%A1inska_napetost&veaction=edit" title="Uredite to stran [v]" accesskey="v"><span>Uredi stran</span></a></li><li id="ca-more-edit" class="collapsible vector-more-collapsible-item mw-list-item"><a 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srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4e/Povr%C5%A1inska_napetost_milnica.jpg/375px-Povr%C5%A1inska_napetost_milnica.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4e/Povr%C5%A1inska_napetost_milnica.jpg/500px-Povr%C5%A1inska_napetost_milnica.jpg 2x" data-file-width="901" data-file-height="599" /></a><figcaption>Površinska napetost milnice v mreži kocke</figcaption></figure> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/Slika:Dscn3156-daisy-water_1200x900.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/30/Dscn3156-daisy-water_1200x900.jpg/250px-Dscn3156-daisy-water_1200x900.jpg" decoding="async" width="250" height="188" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/30/Dscn3156-daisy-water_1200x900.jpg/375px-Dscn3156-daisy-water_1200x900.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/30/Dscn3156-daisy-water_1200x900.jpg/500px-Dscn3156-daisy-water_1200x900.jpg 2x" data-file-width="1200" data-file-height="900" /></a><figcaption>Cvet se zaradi površinske napetosti ne potopi</figcaption></figure> <p><b>Površínska napétost</b> je <a href="/w/index.php?title=Fizikalni_pojav&action=edit&redlink=1" class="new" title="Fizikalni pojav (stran ne obstaja)">pojav</a>, ko se <a href="/w/index.php?title=Gladina&action=edit&redlink=1" class="new" title="Gladina (stran ne obstaja)">gladina</a> <a href="/wiki/Kapljevina" title="Kapljevina">kapljevine</a> obnaša kot prožna plošča. Posledica tega je, da se kapljevine zberejo v <a href="/wiki/Kaplja" title="Kaplja">kapljice</a>, kot tudi <a href="/w/index.php?title=Kapilarnost&action=edit&redlink=1" class="new" title="Kapilarnost (stran ne obstaja)">kapilarnost</a>, pojav, da se kapljevina, ki moči podlago, vzpne po stenah ozke cevke. Površinsko napetost izkoriščajo tudi nekatere <a href="/wiki/%C5%BDu%C5%BEelka" class="mw-redirect" title="Žuželka">žuželke</a> za hojo po vodni gladini. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Vzrok">Vzrok</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Povr%C5%A1inska_napetost&veaction=edit&section=1" title="Uredi razdelek: Vzrok" class="mw-editsection-visualeditor"><span>uredi</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Povr%C5%A1inska_napetost&action=edit&section=1" title="Urejanje izvorne kode razdelka: Vzrok"><span>uredi kodo</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Površinska napetost je posledica privlačnih <a href="/wiki/Van_der_Waalsova_sila" title="Van der Waalsova sila">van der Waalsovih sil</a> med <a href="/wiki/Molekula" title="Molekula">molekulami</a> kapljevine. V notranjosti kapljevine je vsaka molekula obdana z vseh strani z drugimi molekulami, zato jo van der Waalsove sile vlečejo enako v vse smeri in je <a href="/wiki/Rezultanta" title="Rezultanta">rezultanta</a> <a href="/wiki/Sila" title="Sila">sil</a> enaka nič. Za plast molekul na gladini pa to ne velja – molekule iz notranjosti kapljevine delujejo nanje s privlačnimi silami, ki jih pa molekule plina z druge strani ne uravnovesijo, tako da jih uravnovesi le <a href="/wiki/Stisljivost" title="Stisljivost">nestisljivost</a> kapljevine. </p><p>Čista voda ima pri <a href="/wiki/Standardni_pogoji" title="Standardni pogoji">standardnih pogojih</a> površinsko napetost približno 70 mN/m. Površinsko napetost močno zmanjša dodatek <a href="/wiki/Milo" title="Milo">mila</a>, <a href="/wiki/Detergent" title="Detergent">detergenta</a> ali drugih <a href="/wiki/Amfifilnost" title="Amfifilnost">amfifilnih</a> snovi. </p> <div class="mw-heading mw-heading2"><h2 id="Koeficient_površinske_napetosti"><span id="Koeficient_povr.C5.A1inske_napetosti"></span>Koeficient površinske napetosti</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Povr%C5%A1inska_napetost&veaction=edit&section=2" title="Uredi razdelek: Koeficient površinske napetosti" class="mw-editsection-visualeditor"><span>uredi</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Povr%C5%A1inska_napetost&action=edit&section=2" title="Urejanje izvorne kode razdelka: Koeficient površinske napetosti"><span>uredi kodo</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Ker je za molekule <a href="/wiki/Energija" title="Energija">energijsko</a> ugodneje, če so v notranjosti kapljevine, kot če so na gladini, je treba opraviti <a href="/wiki/Delo" title="Delo">delo</a>, da se iz notranjosti kapljevine prinese molekulo na gladino in se s tem poveča njeno <a href="/wiki/Povr%C5%A1ina" title="Površina">površino</a>. Sorazmernosti koeficient med delom <i>A</i> in spremembo površine gladine Δ<i>S</i> je <i>površinska napetost</i> γ: </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle A=\gamma \Delta S\!\,.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>A</mi> <mo>=</mo> <mi>γ</mi> <mi mathvariant="normal">Δ</mi> <mi>S</mi> <mspace width="negativethinmathspace" /> <mspace width="thinmathspace" /> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle A=\gamma \Delta S\!\,.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/56ba7fd5ddb19846e96eacabd27e63f6c526358d" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:10.186ex; height:2.676ex;" alt="{\displaystyle A=\gamma \Delta S\!\,.}"></span></dd></dl> <p>Zaradi površinske napetosti deluje na rob gladine <a href="/wiki/Sila" title="Sila">sila</a> <i>F</i>, ki je premo sorazmerna <a href="/wiki/Dol%C5%BEina" title="Dolžina">dolžini</a> roba <i>b</i>. Sorazmernostni koeficient je spet <i>površinska napetost</i> γ: </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle F=\gamma b\!\,.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>F</mi> <mo>=</mo> <mi>γ</mi> <mi>b</mi> <mspace width="negativethinmathspace" /> <mspace width="thinmathspace" /> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle F=\gamma b\!\,.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/973dae70ac15e21d91d08f6423c692e844e5c83d" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:7.746ex; height:2.676ex;" alt="{\displaystyle F=\gamma b\!\,.}"></span></dd></dl> <p>Za površinsko napetost se uporabljajo oznake γ. <a href="/wiki/Mednarodni_sistem_enot" title="Mednarodni sistem enot">Mednarodni sistem enot</a> predpisuje za površinsko napetost <a href="/wiki/Izpeljane_enote_SI" class="mw-redirect" title="Izpeljane enote SI">izpeljano</a> <a href="/wiki/Fizikalna_enota" class="mw-redirect" title="Fizikalna enota">enoto</a> <a href="/wiki/Newton" title="Newton">N</a>/<a href="/wiki/Meter" title="Meter">m</a>. </p><p>Površinsko napetost nekateri kapjevin na meji z <a href="/wiki/Zrak" title="Zrak">zrakom</a> pri <a href="/wiki/Temperatura" title="Temperatura">temperaturi</a> 20 °C podaja razpredelnica.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Phys_Chem_Surf_2-0" class="reference"><a href="#cite_note-Phys_Chem_Surf-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable sortable"> <tbody><tr> <th><a href="/wiki/Kapljevina" title="Kapljevina">kapljevina</a> </th> <th><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \gamma \!}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>γ</mi> <mspace width="negativethinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \gamma \!}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/29c21ef2fcf09bedee58d7841c94703c9c378ede" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; margin-right: -0.387ex; width:1.262ex; height:2.176ex;" alt="{\displaystyle \gamma \!}"></span> </th></tr> <tr> <td><a href="/wiki/%C5%BDivo_srebro" title="Živo srebro">živo srebro</a></td> <td>0,4865 N/m </td></tr> <tr> <td><a href="/wiki/Voda" title="Voda">voda</a></td> <td>0,07286 ± 0,00005 </td></tr> <tr> <td>voda (25 °C)</td> <td>0,07199 ± 0,00005 </td></tr> <tr> <td>voda (50 °C)</td> <td>0,0679 </td></tr> <tr> <td>voda (80 °C)</td> <td>0,0626 </td></tr> <tr> <td><a href="/wiki/Benzen" title="Benzen">benzen</a></td> <td>0,0288 </td></tr> <tr> <td>benzen (30 °C)</td> <td>0,02756 </td></tr> <tr> <td><a href="/wiki/Toluen" title="Toluen">toluen</a></td> <td>0,02852 </td></tr> <tr> <td><a href="/wiki/Kloroform" title="Kloroform">kloroform</a></td> <td>0,02667 </td></tr> <tr> <td><a href="/w/index.php?title=Propionska_kislina&action=edit&redlink=1" class="new" title="Propionska kislina (stran ne obstaja)">propionska kislina</a></td> <td>0,02669 </td></tr> <tr> <td><a href="/wiki/Maslena_kislina" class="mw-redirect" title="Maslena kislina">maslena kislina</a></td> <td>0,02651 </td></tr> <tr> <td><a href="/wiki/Ogljikov_tetraklorid" title="Ogljikov tetraklorid">ogljikov tetraklorid</a></td> <td>0,02643 </td></tr> <tr> <td><a href="/wiki/Butilacetat" title="Butilacetat">butilacetat</a></td> <td>0,02509 </td></tr> <tr> <td><a href="/wiki/Eter" title="Eter">eter</a> (25 °C)</td> <td>0,02014 </td></tr> <tr> <td><a href="/wiki/Glicerol" title="Glicerol">glicerol</a> (18°C)</td> <td>0,0625 </td></tr> <tr> <td><a href="/wiki/Olj%C4%8Dno_olje" title="Oljčno olje">oljčno olje</a></td> <td>0,033 </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Merjenje_površinske_napetosti"><span id="Merjenje_povr.C5.A1inske_napetosti"></span>Merjenje površinske napetosti</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Povr%C5%A1inska_napetost&veaction=edit&section=3" title="Uredi razdelek: Merjenje površinske napetosti" class="mw-editsection-visualeditor"><span>uredi</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Povr%C5%A1inska_napetost&action=edit&section=3" title="Urejanje izvorne kode razdelka: Merjenje površinske napetosti"><span>uredi kodo</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Za <a href="/wiki/Meritev" title="Meritev">merjenje</a> površinske napetosti so razvili številne metode: </p> <ul><li><a href="/w/index.php?title=Du_No%C3%BCyev_obro%C4%8D&action=edit&redlink=1" class="new" title="Du Noüyev obroč (stran ne obstaja)">du Noüyev obroč</a></li> <li><a href="/w/index.php?title=Wilhelmyjeva_plo%C5%A1%C4%8Da&action=edit&redlink=1" class="new" title="Wilhelmyjeva plošča (stran ne obstaja)">Wilhelmyjeva plošča</a></li> <li><a href="/w/index.php?title=Kapilarnost&action=edit&redlink=1" class="new" title="Kapilarnost (stran ne obstaja)">kapilarnost</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Sklici">Sklici</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Povr%C5%A1inska_napetost&veaction=edit&section=4" title="Uredi razdelek: Sklici" class="mw-editsection-visualeditor"><span>uredi</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Povr%C5%A1inska_napetost&action=edit&section=4" title="Urejanje izvorne kode razdelka: Sklici"><span>uredi kodo</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist columns references-column-width" style="list-style-type: decimal;"> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><a class="mw-selflink-fragment" href="#CITEREFBreuer1993"> Breuer (1993)</a>, str. 63.</span> </li> <li id="cite_note-Phys_Chem_Surf-2"><span class="mw-cite-backlink"><a href="#cite_ref-Phys_Chem_Surf_2-0">↑</a></span> <span class="reference-text"><a class="mw-selflink-fragment" href="#CITEREFAdamsonGast1997"> Adamson; Gast (1997)</a>.</span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Viri">Viri</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Povr%C5%A1inska_napetost&veaction=edit&section=5" title="Uredi razdelek: Viri" class="mw-editsection-visualeditor"><span>uredi</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Povr%C5%A1inska_napetost&action=edit&section=5" title="Urejanje izvorne kode razdelka: Viri"><span>uredi kodo</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><style data-mw-deduplicate="TemplateStyles:r5980307">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"»""«""›""‹"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:#d33}.mw-parser-output .cs1-visible-error{color:#d33}.mw-parser-output .cs1-maint{display:none;color:#3a3;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}</style><cite id="CITEREFAdamsonGast1997" class="citation cs2">Adamson, Arthur Wilson; Gast, Alice Petry (1997), <i>Physical chemistry of surfaces</i> (6. izd.), Wiley, <a href="/wiki/Vzajemni_bibliografski_sistem_COBISS" title="Vzajemni bibliografski sistem COBISS">COBISS</a> <a rel="nofollow" class="external text" href="https://plus.cobiss.net/cobiss/si/sl/bib/19358213">19358213</a>, <a href="/wiki/ISBN_(identifikator)" class="mw-redirect" title="ISBN (identifikator)">ISBN</a> <a href="/wiki/Posebno:ViriKnjig/0-471-14873-3" title="Posebno:ViriKnjig/0-471-14873-3"><bdi>0-471-14873-3</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=knjiga&rft.btitle=Physical+chemistry+of+surfaces&rft.edition=6.&rft.pub=Wiley&rft.date=1997&rft_id=https%3A%2F%2Fplus.cobiss.net%2Fcobiss%2Fsi%2Fsl%2Fbib%2F19358213%23full%23id-name%3DCOBISS&rft.isbn=0-471-14873-3&rft.aulast=Adamson&rft.aufirst=Arthur+Wilson&rft.au=Gast%2C+Alice+Petry&rfr_id=info%3Asid%2Fsl.wikipedia.org%3APovr%C5%A1inska+napetost" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r5980307"><cite id="CITEREFBreuer1993" class="citation cs2">Breuer, Hans (1993), <i>Atlas klasične in moderne fizike</i>, Ljubljana: DZS, str. 62–63, <a href="/wiki/Vzajemni_bibliografski_sistem_COBISS" title="Vzajemni bibliografski sistem COBISS">COBISS</a> <a rel="nofollow" class="external text" href="https://plus.cobiss.net/cobiss/si/sl/bib/35693056">35693056</a>, <a href="/wiki/ISBN_(identifikator)" class="mw-redirect" title="ISBN (identifikator)">ISBN</a> <a href="/wiki/Posebno:ViriKnjig/86-341-1105-9" title="Posebno:ViriKnjig/86-341-1105-9"><bdi>86-341-1105-9</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=knjiga&rft.btitle=Atlas+klasi%C4%8Dne+in+moderne+fizike&rft.place=Ljubljana&rft.pages=62-63&rft.pub=DZS&rft.date=1993&rft_id=https%3A%2F%2Fplus.cobiss.net%2Fcobiss%2Fsi%2Fsl%2Fbib%2F35693056%23full%23id-name%3DCOBISS&rft.isbn=86-341-1105-9&rft.aulast=Breuer&rft.aufirst=Hans&rfr_id=info%3Asid%2Fsl.wikipedia.org%3APovr%C5%A1inska+napetost" class="Z3988"></span></li></ul> <div role="navigation" class="navbox" aria-label="Navbox" style="padding:3px"><table class="nowraplinks hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Wikipedija:Normativna_kontrola" title="Wikipedija:Normativna kontrola">Normativna kontrola: Narodne knjižnice</a> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q170749#identifiers" title="Uredite to na Wikipodatkih"><img alt="Uredite to na Wikipodatkih" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://catalogue.bnf.fr/ark:/12148/cb11977813j">Francija</a> <a rel="nofollow" class="external text" href="https://data.bnf.fr/ark:/12148/cb11977813j">(data)</a></span></li> <li><span class="uid"><a rel="nofollow" class="external text" href="https://d-nb.info/gnd/4139720-4">Nemčija</a></span></li> <li><span class="uid"><a rel="nofollow" class="external text" href="http://uli.nli.org.il/F/?func=find-b&local_base=NLX10&find_code=UID&request=987007551147205171">Izrael</a></span></li> <li><span class="uid"><a rel="nofollow" class="external text" href="https://id.loc.gov/authorities/subjects/sh85130727">ZDA</a></span></li> <li><span class="uid"><a rel="nofollow" class="external text" href="https://id.ndl.go.jp/auth/ndlna/00563859">Japonska</a></span></li> <li><span class="uid"><a rel="nofollow" class="external text" href="https://aleph.nkp.cz/F/?func=find-c&local_base=aut&ccl_term=ica=ph215338&CON_LNG=ENG">Češka republika</a></span></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; 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